Emery Hemingway
9c6b720ec1
Add a new 'Vfs_watch_handle' type to the VFS interface. This handle type will pass a handle context up through the I/O handler to the application when a notification event occurs. Watch support implemented for RAM and File_system plugins, all other file-systems return WATCH_ERR_STATIC by default. Test at run/fs_rom_update_ram and run/fs_rom_update_fs. Fix #1934
152 lines
2.8 KiB
C++
152 lines
2.8 KiB
C++
/*
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* \brief Representation of an open file
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* \author Norman Feske
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* \date 2011-02-17
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__VFS__VFS_HANDLE_H_
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#define _INCLUDE__VFS__VFS_HANDLE_H_
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#include <vfs/directory_service.h>
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namespace Vfs{
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class Vfs_handle;
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class File_io_service;
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class File_system;
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class Vfs_watch_handle;
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}
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class Vfs::Vfs_handle
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{
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private:
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Directory_service &_ds;
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File_io_service &_fs;
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Genode::Allocator &_alloc;
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int _status_flags;
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file_size _seek = 0;
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/*
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* Noncopyable
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*/
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Vfs_handle(Vfs_handle const &);
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Vfs_handle &operator = (Vfs_handle const &);
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public:
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/**
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* Opaque handle context
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*/
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struct Context : List<Context>::Element { };
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Context *context = nullptr;
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class Guard
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{
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private:
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/*
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* Noncopyable
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*/
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Guard(Guard const &);
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Guard &operator = (Guard const &);
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Vfs_handle * const _handle;
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public:
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Guard(Vfs_handle *handle) : _handle(handle) { }
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~Guard()
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{
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if (_handle)
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_handle->_ds.close(_handle);
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}
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};
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enum { STATUS_RDONLY = 0, STATUS_WRONLY = 1, STATUS_RDWR = 2 };
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Vfs_handle(Directory_service &ds,
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File_io_service &fs,
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Genode::Allocator &alloc,
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int status_flags)
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:
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_ds(ds), _fs(fs),
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_alloc(alloc),
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_status_flags(status_flags)
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{ }
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virtual ~Vfs_handle() { }
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Directory_service &ds() { return _ds; }
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File_io_service &fs() { return _fs; }
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Allocator &alloc() { return _alloc; }
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int status_flags() const { return _status_flags; }
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void status_flags(int flags) { _status_flags = flags; }
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/**
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* Return seek offset in bytes
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*/
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file_size seek() const { return _seek; }
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/**
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* Set seek offset in bytes
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*/
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void seek(file_offset seek) { _seek = seek; }
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/**
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* Advance seek offset by 'incr' bytes
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*/
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void advance_seek(file_size incr) { _seek += incr; }
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};
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class Vfs::Vfs_watch_handle
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{
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public:
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/**
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* Opaque handle context
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*/
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struct Context : List<Context>::Element { };
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private:
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File_system &_fs;
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Genode::Allocator &_alloc;
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Context *_context = nullptr;
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/*
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* Noncopyable
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*/
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Vfs_watch_handle(Vfs_watch_handle const &);
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Vfs_watch_handle &operator = (Vfs_watch_handle const &);
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public:
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Vfs_watch_handle(File_system &fs,
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Genode::Allocator &alloc)
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:
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_fs(fs), _alloc(alloc)
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{ }
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virtual ~Vfs_watch_handle() { }
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File_system &fs() { return _fs; }
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Allocator &alloc() { return _alloc; }
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virtual void context(Context *context) { _context = context; }
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Context *context() const { return _context; }
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};
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#endif /* _INCLUDE__VFS__VFS_HANDLE_H_ */
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